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<br />~."" .~ <br /> <br />. <br /> <br />. <br /> <br />RECEIVED' <br />. DEe 1 4 1973 <br /> <br />,..( . <br />, <br /> <br />-. -- ..' ~" .-.~ .. ~. .,-. ~~ .~. - .-". <br /> <br />HYDROLOGY R.o:.t'ORT ON TIlE PROPOSED P.ARBLE SKI AIillA <br /> <br />COLO. WATER . <br />CONSERvATION BOARD I <br /> <br />On !:ay 27. Paul !l.1uk of the White River National Forest. John Nishioura i <br />and Cliff Bunt of the REgior~l Cifiee mede a soil end hydrologic inspection I <br />of the prcpcs2d f;nrble Ski Area. The erea is drained by C"rbonate Creek on .,' <br />. the west with sooe lioited draincge down the steep south face directly into <br />the Crystnl hiver. TIle water course of Carbonate Creek is a steep end . <br />erosive canyon l"bile the soutb face is a shale escarpment which is highly <br />erosive. <br /> <br />The soil on the area (see cap) is deep enough to provide adequate subsurface <br />drainage. At present thcr~ is little evidence of natural overland flow <br />occurring on the developcent site. There is, however, one natural pond on <br />the ar~a ~lhich demonstrates the possibility of SO:!le impervious layers. <br /> <br />.~nagement @ust be directed at preserving the natural infiltration cepec- <br />" ities of the soil and avoiding overland flow. There is evidence that tha <br />Boils are subject to slucpagc indicating that the concentration of water <br />on the surface cust be avoided. Cuts into the underlying ;':"ncos, shale call <br />not betolernted cue to their erosive nature and limited revegetation po- <br />tential.' If any construction is authorized, hand clearinn is preferred to <br />machine clearing since it better preserves the hydrologic integrity of the <br />s011 and oini~izes construction phase erosion. ~ater bars should lead the <br />water allay from the shale escarpment on the south. Any live water on the <br />Bouth shale escaq:>r.lent will cause serious erosion problems. For the Same <br />reason the d~"ping of live water over the canyon lip into Carbonate Creek <br />must be avoided. \;ater bars should be constructed as the work progresses. <br />These initial water bars can be constructed so as to accommodate construc- <br />t10n traffic and are to be replaced by a water bar system that conforms to <br />existing Forest Service standards vhen the disturbed area is seeded. The <br />history of slum~age indicates thut the water bar system should not conCen- <br />trate st~~ding water on the surface. Velocity dissipaters and holding' <br />ponds should be installed in the Carbonate Creek drainage to slow erosion <br />and trap bedload sediment. . <br /> <br />The water in the irrigation ditch which was used to flood irrigate the hay <br />meadows on private land should be diverted back into the natural drainage. <br />This water is a problem to access and only interferes with construction <br />and increases erosion. So~ snowmelt water is ponding along the south <br />eScarpment. These low areas should be drained to prevent slu~page of <br />portions of the south face. <br /> <br />CLIFFORD F. HUNT <br />Hydrologist <br /> <br />f' <br /> <br />Prepared by <br />USDA-Forest Service <br />Div. of Waterllhed 11gJJt. <br /> <br />I" ~ <br /> <br />, , <br />\ <br />